The cometary activity of 2017 YL4 was pointed out by Sam Deen (Apr. 6, 2021, comets-ml).
Orbital Elements
Perturbed ephemeris below is based on 63-day-arc elements from MPO 603996.
Last observed on 2018 Feb. 13.
Epoch (TT/JD) T (TT/JD) Peri. Node Incl.
2458320.50000 2458320.2218443 44.59207 120.03427 88.96517
e q a Epoch (TT)
0.9739818 4.2636469 163.87187 2018/07/21.00